Electromotive hand sewer

ABSTRACT

This invention relates to a hand sewer which is actuated by a motor with dry cells or household electricity and is worked by a single hand. The hand sewer comprises a box and a handle as one body. The handle accommodates dry cells or a converter for using household electricity and has a switch button which can be easily pushed by a forefinger. The box is covered with a needle plate and accommodates a motor, a transmission gearing, a reciprocating means, a looping means and a feeding means. A reciprocating rod of the reciprocating means pierces out through the needle plate from the inside of the box and has an arm fixed to the upper end. The arm has a needle attached to the tip. The needle plate has a sewing hole and a pair of parallel slots for a feed dog and is provided with a lever plate comprising a presser foot and a presser lifter. By driving the motor, the transmission gearing actuates harmonically the needle, the looper and the feed dog.

United States Patent 1191 Seyama ELECTROMOTIVE HAND SEWER [75] lnventon. Tsuneo Seyama, Yono, Japan [73] Assignee: Aidearu Kiki Co., Ltd., Tokyo,

Japan [22] Filed: Jan. 3, 1973 [21] Appl. No.: 320,755

[30] Foreign Application Priority Data Feb. 7, 1972 Japan 47-15638 52 US. Cl. 112/169 51 Int. Cl D05b 1/00 [58] Field-of Search 112/169, 80, 11; 128/340; 223/102, 103, 104

[56] References Cited UNITED STATES PATENTS I 1,809,192 6/1931 Cahill et a1. 112/169 2,778,328 1/1957 Doyen et al. 112/11 3,745,950 7/1973 Kato 112/169 FOREIGN PATENTS OR APPLICATIONS 803,870 ll/l958 GreatBritain ....1l2/ll" [1 3,834,333 1451 Sept. 10, 1974 Primary Examiner.lames R. Boler Assistant Examiner--Wai M. Chan Attorney, Agent, or Firm-Michael S. Striker I 57 ABSTRACT This invention relates to a hand sewer which is actuated by a motor with dry cells or household electricity and is worked by a single hand. The hand sewer comprises a box and a handle as one body. The handle ac- .commodates dry cells or a converter for using household electricity and has a switch button which can be easily pushed by a forefinger. The box is covered with a needle plate and accommodates a motor, a transmission gearing, a reciprocating means, a looping means and a feeding means. A reciprocating rod of the reciprocating means pierces out through the needle plate from the inside of the box and has an arm fixed to the upper end. The arm has a needle attached to the tip. The needle plate has a sewing hole and a pair of parallel slots for a feed dog and is provided with a lever plate comprising a presser foot and a presser lifter. By driving the motor, the transmission gearing actuates i harmonically the needle,'the looper and the feed dog.

2 Claims, 9 Drawing Figures PAIENTEDSEP] mam $334,333

' sum 1 or 3 PAIEN'IEUSEP 1 01914 3.834.313 SHEEI 3M 3 1 ELECTROMOTIVE HAND SEWER This invention relates to a hand sewer which is actuated by an electric motor with dry cells or household electricity.

Heretofore, the conventional hand sewer has been actuated by employing a thumb, accordingly the hand becomes fatigued. And for using it, skill is also necessary. If the users are not skilled, it happens to drop a stitch and curve a seam at sewing the cloth, accordingly the sewed cloth becomes unseemly.

This invention has been achieved for improving these defects and using easily the hand sewer.

One object of this invention is to provide a hand sewer which is driven by an electric motor with dry cells or household electricity.

Another object of this'invention is to provide a hand sewer which is easily operated by a single hand.

Still another object of this invention is to provide a hand sewer which is offered at a cheap price.

Briefly stated in accordance with one aspect of this invention, there is provided a hand sewer comprising a handle and a box as one body. Said handle accommodates dry cells or a converter for using household electricity. Said box is covered with a needle plate which has a supporting frame fixed to the under side of said needle plate, and accommodatea a motor and a transmission gearing installed in said supporting frame, a reciprocating rod having a sliding block attached to the lower end of said rod, a swinging shaft having a cam plate and a looper fixed to the both ends of said swinging shaft and a feed dog engaging with a circular disk fixed eccentrically to one end of a shaft of said final transmission gear which has a pin planted eccentrically on the side surface of said gear. Said pin is inserted in a transverse groove of the sliding block, thereby the transmission gearing is made to engage with the reciprocating rod. The needle plate has a sewing hole, a pair of parallel slots for the feed dog and a perforation for the reciprocating rod. Said reciprocating rod pierces out through said perforation from the inside of said box and has an arm fixed to the upper end of said rod. A sewing needle is attached to the tip of said arm. A supporting axis is planted on the needle plate and pivots a lever plate of which one portion becomes a presser lifter pushed up by a spring and the other portion becomes a presser foot pressing the feed dog. A switch button is provided on the underside of the handle, therefore the forefinger can easily push it for driving the motor. From mentioned above, the motor rotates by pushing a switch button by a forefinger and then the transmission gearing is driven and the pin of said gearing slides along the transverse groove of the sliding block while revolving about the gear shaft. Therefore, the sliding block rises and falls periodically and the reciprocating rod rises and falls simultaneously as the same. This movement becomes a stitching action of the needle which is fixed to the arm. The feed dog engages with the circular disk fixed eccentrically to a shaft of the final transmission gear, therefore it operates a feeding action with the presser foot. The looper swings with cam plate by reciprocation of the reciprocating rod and forms a loop by hooking the sewing thread.

As mentioned above, this invention is constructed so as to operate harrnonically these actions.

This invention will be better understood and other 7 objects and additional advantages of the invention will become appaf ent upon perusal of the following description taken in connection with the drawings, in which:

FIG. 1 is a perspective view of a hand sewer embodying this invention;

FIG. 2 is a side view of a mechanism thereof cutting off a box;

FIG. 3 is a front elevational view of the mechanism thereof;

FIG. 4 is a rear elevational view of FIG. 2;

FIG. 5 is a right side elevational view of FIG. 2;

FIG. 6 is'a partly sectional side elevational view of FIG. 3 taken along line VI-VI;

FIG. 7 is a perspective view showing engagement of a looper, a cam plate and a reciprocating means;

FIG. 8 is a partly sectional side elevational view of FIG. 2 taken along line VIII-VIII; and

FIG. 9 is a partly sectional side elevational view of FIG. 4 taken along line IXIX, showing a feed dog, a looper and a presser foot.

Referring more particularly to-the drawings, the preferred embodiment of this invention will now be described. A body of this hand sewer comprises a handle 1 and a box 2. Said handle 1 accommodates dry cells or a converter for household electricity (not shown in the drawings). Said box 2 accommodates a supporting frame 3, a motor 4, transmission gears 6, 7 and 8, a reciprocating rod 12 having a sliding block 13 attached to the lower end of said rod 12, a oscillatable shaft 19 having a cam plate 17 and a looper 23 fixed to the both ends of said swinging shaft 19, and a feed dog 28 engaging with a circular disk 30 fixed eccentrically to one end of a shaft of said transmission gear 8. A needle plate 9 becomes the upper lid of the box 2. Said reciprocating rod 12 is made to pierce out'through'the perforation on said needle plate 9from the inside of said box 2 and has an arm 11 fixed to the top of said'rod 12. Said arm 11 is provided with a sewing needle 10 at the tip of said arm 11. Said sliding block 13 is fixed transversely to the lower end of said reciprocating rod 12. There is provided a transverse groove 14 on the front side surface of said sliding block 13. An engaging pin 15 which is planted eccentrically on the side surface of the gear 8 is slidably inserted in said groove 14. A cam pin 16 which is planted on the side surface of. said sliding block 13 opposite to said groove 14 is slidably inserted in a cam slot 18 perforated in the cam plate 17. The lower end of said plate 17 is fixed to one end of the oscillatable shaft 19 pivoted at the supporting frame 3. A guide pin 20 is planted at the center of the back side surface of said sliding block 13 and is slidably inserted in a straight slot 22 perforated on a guide plate 21 which is fixed to the under side of the needle plate 9. The looper 23 is fixed to the other end of said oscillatable shaft 19 with the lower end of said looper 23 and extends upwards to the beneath of .a sewing hole perforated on the needle plate 9. The circular disk 30 is fixed eccentrically to the end of the shaft 34 of the transmission gear 8 and engages with said feed dog 28. A lever plate 24 is pivoted at a supporting axis 25 planted on the needle plate 9, and the rear portion of said lever plate 24 becomes a presser lifter 27 which is pushed up by a spring 29 and the front portion of said. lever plate 24 becomes a presser foot 26 which presses the feed dog 28. Reference mumerals 31, 32 and 33 show a bobbin pivot, a tension wheel of sewing thread and a cover of the arm 11, respectively.

In accordance with rotation of said transmission gearing, the feed dog 28 repeats to appear and disappear from the parallel slots on the needle plate 9 in connection with reciprocation of the needle and hooking of the looper 23. The transmission gear '6 projects partially out from the side slit of the box 2 and operates also as a needle position adjusting gear.

This invention is constructed as mentioned above, therefore use of this hand sewer is as follows. The transmission gear 6 is turn counterclockwise until the needle 10 comes to the highest position. The presser foot 26 is raised up by pushing down the presser lifter 27 and thematerial is put beneath the presser foot 26. The presser foot 26 falls down'on the material by releasing the presser lifter 27. Then a sewing thread is pulled from the bobbin of the pivot 31 and is made to pass through the tension wheel 32 and a needle eye of the needle 10. The hand sewer is held in the right hand and the motor 4 is driven by pushing a switch button on the under side of the handle 1. Accordingly, the transmission gears 6, 7 and 8 rotate, and the engaging pin revolves upwards and downwards and raises and lowers vertically the sliding block 13 along the straight slot 22 with the guide pin and simultaneously the reciprocating rod 12 reciprocates vertically together with the arm 11. Therefore, the movement of the arm 11 makes the needle 10 to reciprocate through the sewing hole and stitch the material put on the needle plate 9. Meanwhile the cam pin 16 reciprocates vertically along the cam slot 18 on the cam plate 17 fixed to the oscillatable shaft 19, therefore said cam plate 17 is swung about the oscillatable shaft 19 and the looper 23 attached to the other end of said shaft 19 is simultaneously swung. The looper 23 hooks the sewing thread passing through the needle eye to form a loop of the thread beneath the needle plate 9. A following stitch of the needle 10 makes the thread inserted into the loop. The feed dog 28 sends the material put on the needle plate 9 toward one direction in co-operation with the presser foot 26. Such stitching, looping and feeding operations work harmonically to sew easily and smoothly the material.

From mentioned above, this invention has such a advantage that sewing operation is worked by pushing momentarily the switch button by a forefinger, namely it is achieved only by holding the handle without working the thumb. Therefore, the users do not become weary for handling. Besides, sewing does not drop a stitch and not curve the seam and gives a good appearance to the sewed material.

While a particular embodiment of the invention has been illustrated, modification thereof will readily occur to those skilled in the art. It should a be understood therefore that the invention is not limited to the particular arrangement disclosed but that the appended claims are intended to cover all modifications which do not depart from the true spirit and scope of the invention.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

rod in said box portion and extending through said hole, said reciprocating rod including an arm fixed to the upper end thereof, a sliding block fixed to the lower end of said rod, said sliding block having a transverse groove formed in a front side and a pair of pins provided on respective other sides thereof; a guide plate under said needle plate and having a straight slot, one of said pins being slidably received in said straight slot; an oscillatable shaft pivoted to said supporting frame; a cam platehaving a lower end fixed to one end of said oscillatable shaft, said cam plate having a cam slot and the other of said pins being slidably received in said cam slot; a looper fixed to the other end of said oscillatable shaft; a feed dog engaging with said circular disk and extending into said parallel slots of said needle plate; and a lever plate pivoted on said needle plate for movement about a pivot axis and comprising a presser foot for pressing said feed dog which appears and disappears from said slots, and a presser lifter.

2. An electromotive handsewer, comprising a housing including a box portion and a handle portion; electrical converter means for converting electrical line current to a lower-voltage current; a needle plate covering said box portion and having a hole,v a sewing opening and a pair of parallel slots; a supporting frame mounted beneath said needle frame; a motor and a transmission gear in said supporting frame and connected to each other, said transmission gear including a final gear having a shaft; a circular disk fixed eccentrically to said shaft of said final gear; a reciprocating rod in said box portion and extending through said hole, said reciprocating rod including an arm fixed to the upper end thereof, a sliding block fixed to the lower end of said rod, said sliding block having a transverse groove formed in a front side-and a pair of pins provided on respective other sides thereof; a guide plate under said needle plate and having a straight slot, one of said pins being slidably received in said straight slot; an oscillatable shaft pivoted to said supporting frame; a cam plate havirrgaiawi nzifiiatafie end of said oscillatable shaft, said cam plate having a cam slot and the other of said pins being slidably received in said cam slot; a looper fixed to the other end of said oscillatable shaft; a feed dog engaging with said circular disk and extending into said parallel slots of said needle plate; and a lever plate pivoted on said needle plate for movement about a pivot axis and comprising a presser foot for pressing said feed dog which appears and disappears from said slots, and a presser lifter. 

1. An electromotive handsewer, comprising a housing including a box portion and a handle portion; batteries accommodated in said handle portion; a needle plate covering said box portion and having a hole, a sewing opening and a pair of parallel slots; a supporting frame mounted beneath said needle frame; a motor and a transmission gear in said supporting frame and connected to each other, said transmission gear including a final gear having a shaft; a circular disk fixed eccentrically to said shaft of said final gear; a reCiprocating rod in said box portion and extending through said hole, said reciprocating rod including an arm fixed to the upper end thereof, a sliding block fixed to the lower end of said rod, said sliding block having a transverse groove formed in a front side and a pair of pins provided on respective other sides thereof; a guide plate under said needle plate and having a straight slot, one of said pins being slidably received in said straight slot; an oscillatable shaft pivoted to said supporting frame; a cam plate having a lower end fixed to one end of said oscillatable shaft, said cam plate having a cam slot and the other of said pins being slidably received in said cam slot; a looper fixed to the other end of said oscillatable shaft; a feed dog engaging with said circular disk and extending into said parallel slots of said needle plate; and a lever plate pivoted on said needle plate for movement about a pivot axis and comprising a presser foot for pressing said feed dog which appears and disappears from said slots, and a presser lifter.
 2. An electromotive handsewer, comprising a housing including a box portion and a handle portion; electrical converter means for converting electrical line current to a lower-voltage current; a needle plate covering said box portion and having a hole, a sewing opening and a pair of parallel slots; a supporting frame mounted beneath said needle frame; a motor and a transmission gear in said supporting frame and connected to each other, said transmission gear including a final gear having a shaft; a circular disk fixed eccentrically to said shaft of said final gear; a reciprocating rod in said box portion and extending through said hole, said reciprocating rod including an arm fixed to the upper end thereof, a sliding block fixed to the lower end of said rod, said sliding block having a transverse groove formed in a front side and a pair of pins provided on respective other sides thereof; a guide plate under said needle plate and having a straight slot, one of said pins being slidably received in said straight slot; an oscillatable shaft pivoted to said supporting frame; a cam plate having a lower end fixed to one end of said oscillatable shaft, said cam plate having a cam slot and the other of said pins being slidably received in said cam slot; a looper fixed to the other end of said oscillatable shaft; a feed dog engaging with said circular disk and extending into said parallel slots of said needle plate; and a lever plate pivoted on said needle plate for movement about a pivot axis and comprising a presser foot for pressing said feed dog which appears and disappears from said slots, and a presser lifter. 